CBSE Class 12 Chemistry Basic Concepts of Chemistry Revision Cards

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CBSE Class 12 Chemistry Haloalkanes Haloarenes 8

Q2. Fill in the blanks :

a) No. of significant figure in 0.0025 is ------------

b) The rounded up value of 20.058 up to 4 significant figure is -----------

c) Sum of mole fraction of all the components present in solution ------------

d) Unit of molarity is -----------

e) Out of molarity and molality,-------------- changes with temperature.

f) Mass of one mole of a substance in gram is called………………………….

g) One mole of any gas at S T P occupies………………………………………………

h) Simplest whole number ratio of various atoms present in one molecule of a compound is called……………………………………………….

i) Number of atoms present in 5 u of He is ……………………………………

j) Number of mole of CO2 present in 4.4g of CO2 is …………………………………….

CARD-3

1. In 3 moles of ethane, calculate the No. of moles of carbon atoms

2. What is the mass of one amu in gram?

3. What is the SI unit of pressure?

4. What is the empirical formula of Benzene? 

5. What is the equivalent mass of sulphuric acid?

6. One gram of Hydrogen reacts with 9 gram of Oxygen to form water. Which one is the limiting reagent?

7. What is the mass of one molecule of CO2?

8. What is the mass of one atom of Sodium?

9. What is the relation between molar mass and vapor density?

10. 10 volumes of Hydrogen gas react with 5 volume of Oxygen gas, how many volumes of water vapor will be produced?

CARD-4

1. A solution is prepared by adding 2 g. of a substance to 18 g of water. Calculate the mass percentage of the solute.

2. Calculate molarity of NaOH in the solution prepared by dissolving its 4 g in enough water to form 250 ml of the solution.

3. Calculate the number of mole, molecule and atoms present in 62 g of Phosphorous. (P4)

4. The density of 3 M solution of NaCl is 1.25 g mL–1. Calculate molality of the solution.

5. Calculate the amount of carbon dioxide that could be produced when

a. 1 mole of carbon is burnt in air

b. 1 mole of carbon is burnt in 16 g of dioxygen

c. 2 moles of carbon are burnt in 16 g of dioxygen.

6. How are 0.50 moles Na2CO3 and 0.50 M Na 2CO3 different?

7. Find the amount of oxalic acid required to prepare 100 ml of M/20 oxalic acid solution?

CARD-5

State whether TRUE OR, FALSE :

1. An element contains particles of only one type which may be atoms or molecules.(T/F)

2. 1 mol of any substance is equal to 6.022 × 10 23 number of the respective particles or entities.(T/F)

3. The no. of moles of any solute present in one liter of solution is called molality.(T/F)

4. Molarity is a better term to express the concentration of a solution .(T/F)

5.1(M) aqueous solution of a solute is more concentrated than 1(m) of the same solute.(T/F) 

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